Bilstein & Fox offer excellent Monotube shock absorbers. Here are a few differences. It really is a matter of personal preference.
• Bilstein offers a limited lifetime warranty; FOX provides a 1-year limited warranty, butFOX shocks are serviceable. Meaning they can be rebuilt with new seals, fresh oil and nitrogen gas charge.
• If you are looking for a shock for 2011-2019 GM HD trucks, Fox is available in extended length versions for 2-3” of lift. The Bilstein 5100 is only available in stock length and will require shock extensions.